Rhodium

ChemGlobe: Rhodium
Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/45.html

ChemicalElements.com: Rhodium
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/rh.html

EnvironmentalChemistry.com: Rhodium
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Rh.html

It's Elemental: Rhodium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele045.html

LANL: Rhodium
History, sources, properties, and uses.
http://periodic.lanl.gov/elements/45.html

Lenntech: Rhodium
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Rh-en.htm

Visual Elements: Rhodium
General and physical information, source, uses, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/rhodium.html

WebElements: Rhodium
Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/webelements/elements/text/Rh/key.html

Wikipedia: Rhodium
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Rhodium

Radiochemistry of Rhodium
Full text of the monograph by James Armstrong (Florida State University, Tallahassee, Florida). [PDF] <small>(May, 1965)</small>
http://library.lanl.gov/cgi-bin/getfile?rc000063.pdf